Fitness device



FIG. 1 is a front view of a fitness device showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a right side perspective view thereof;

FIG. 8 is a second right side perspective view thereof; and,

FIG. 9 is a left side perspective view thereof.

The broken lines illustrate environmental elements of the fitness device which form no part of the claimed design. 

The ornamental design for a fitness device, as shown and described. 